How does the number of valence electrons vary with atomic number?

Answer 1

The number of valence electrons increases sequentially with #Z#.

Read all the answers in this [thread.](https://tutor.hix.ai) The identity of an element depends on #Z#, the atomic number, which is the number of positively charged particles in the element's nucleus.

However, if there are #Z# positive charges, in the NEUTRAL atom, there must necessarily be #Z# negative charges, supplied by #Z# electrons, all whizzing about the nucleus. Conservation of charge is a fundamental principle of Chemistry (and Physics).

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Answer 2

Naomi Aronson

In general, the number of valence electrons in a period (horizontal row) on the periodic table increases with the atomic number. Elements in the same group have the same number of valence electrons in the main groups (groups 1, 2, 13–18).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.